fun day out with 2 1/2 year old, 5 grown women (1 36 weeks pregnant) in south east london/kent???

I am visiting my family and catching up with some old school friends and ds is the only child so far (apart from my next one) Parents live near Bromley and I was wondering what people do with toddlers locally???? Any suggestions?

Do you have a car? If so, pop down to Christmas Tree farm - which is signposted from Downe Village - any friends who don't want to go to the farm (which is a lot of fun) can visit Downe House - home of Charles Darwin, and there are a couple of good pubs in Downe and nearby for lunch.